libstdc++: Fix dangling reference in filesystem::path::filename()

The new -Wdangling-reference warning noticed this.

libstdc++-v3/ChangeLog:

	* include/bits/fs_path.h (path::filename()): Fix dangling
	reference.

(cherry picked from commit 49237fe6ef677a81eae701f937546210c90b5914)

diff --git a/libstdc++-v3/include/bits/fs_path.h b/libstdc++-v3/include/bits/fs_path.h
index 1b4a1b69f377417ca5d140e55fdf99ccf13c283d..7a3d051313472e17e434a3ed4206040e8b40de63 100644 (file)
--- a/libstdc++-v3/include/bits/fs_path.h
+++ b/libstdc++-v3/include/bits/fs_path.h
@@ -1288,9 +1288,9 @@ namespace __detail
       {
        if (_M_pathname.back() == preferred_separator)
          return {};
-       auto& __last = *--end();
-       if (__last._M_type() == _Type::_Filename)
-         return __last;
+       auto __last = --end();
+       if (__last->_M_type() == _Type::_Filename)
+         return *__last;
       }
     return {};
   }